In Sea Urchins,the "Fast Block" and the Longer-Lasting "Slow Block

question 83

Multiple Choice

In sea urchins,the "fast block" and the longer-lasting "slow block" to polyspermy,respectively,are

• A)the acrosomal reaction and the formation of jelly coat.
• B)the cortical reaction and the formation of cortical granules.
• C)the jelly coat of the egg and the vitelline layer.
• D)membrane depolarization and the cortical reaction.
• E)inactivation of the sperm acrosome.

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Definitions:

Income Elasticity

An indicator that shows the variation in demand for a product based on changes in the income levels of consumers.

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Goods for which demand increases as the income of consumers increases and vice versa, showing a direct relationship between income and demand.

Demand Schedule

A list or table showing how much of a good or service consumers will want to buy at different prices.